Improvement in gas-regulating valves



UNITED STATES PATENT OFFICE.

CHARLES M. GRESSON, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN GAS-REGULATING VALVES.

Specification forming part of Letters Patent No. 115,390, dated December13, 1864; antedated December 3, 1864.

.T0 all whom it may concern.: l

Beit known that I, CHARLES M. CEEssoN M. D., of the city ofPhiladelphia, in the State of Pennsylvania, have invented a new anduseful Improvement in the Manufacture of tegulatingValves; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanyin g drawings, and to theletters of reference marked thereon.

My invention consists of a valve having a stem or tail in which areformed two or more excavations or depressions ofdifferent lengths andarranged substantially as described hereinafter, so that on removing thevalve from its seat the longest excavation may form the communicationfor the passage ot'uid prior to the fluid escaping along the shorterexea vation. My improved valve, which is especially adapted togas-regulators, will thus present, for the escape of the fluid, openingsincreasing in number and area as it is removed from the seat.

In the accompanying drawings, Figui es 1,2, and 3 represent my improvedvalves With their stems having excavations of different lengths,

the remaining figures representing transverse sections of the stems atthe diii'erent points 5 indicated.

My improved valve is most easily formed from a cylinder, Figs. 1,2, 3,4, by cutting from or forming upon its exterior surface at the base twoVor more pyramidal, conoidal, or wedge-shaped pieces or depressions, o fk g, p h lg, r 'im h, s 'i nf, of dii'erent lengths, so that while theexcavation of or depression upon 1 the periphery of the cylinder takesout a large segment or sector at its base h i g, g kf, fn t', imh, thecuts or depressions shall gradually taper out to the circumference atsome point above the base op r s, and by allowing one of these taperingexcavations or depressions, o, to extend nearly the whole length of thecylinder and the others to run out at points p r s, less and lessdistant from the base f g 71y fr', 'l ob tain a valve which, as it movesfrom its seat, exposes a more and more rapidly increasing area ofopening without causing the opening at any time to include the entirecircumference of the seat. By this arrangement, when the greatestdelicacy of adjustment is required, the smallest area ot' opening isexposed for the passage of the Huid, and as the quantity of fluidrequired to be passed is increased the area of opening is rapidly augmented by the presentation, successively, of the several wedge-shapedexcavations or depressions in the body 0r tail ofthe valve.

By making the cylinder of a size that will exactly fill the openingthrough the valveseat, but will not bind nor resist longitudinal motion,and by giving to the seat a proper thickness, the valve may be entirelyclosed, and will so continue until the apex of one 0r more of theexcavated or depressed portions o p r s shall pass through thevalve-seat. The closure can be rendered still more certain by giving tothe head of the valve a flange-like projection, x y, Figs. 1, 2, 3, 4,which shall rest upon the seat when the valve is closed.

The advanta ge of this arran gement and form of valve is that I canproduce with one valve successive increments t0 the area of opening inthe valve-seat, as may be desired,in the same manner as that end isobtained by the employment of several coni-cal valves.

I do not claim any particular form of head to the valve 0r anyparticular form of valveseat.

1 claim as my invention and desire to secure by Letters Patent- A valvehaving a stem or tail in which are two or more excavations ordepressions of difi ferent lengths, arranged substantially as and l forthe purpose described.

Y GHAS. M. CRESSON.

